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How do I know if the air shutters in front are correctly opening or closing? There's no indicator or DIC message.
This. Selfie or it didn't happen.At highway speed, set your cruise control, then climb out your window and crawl on your hood and dip your head over the front end and take a gander through the lower grill, it should be closed...
Do what I did a while ago:How do I know if the air shutters in front are correctly opening or closing? There's no indicator or DIC message.
Looking at a 2018+ OEM wiring diagram, I came across a LIN bus, it was labeled a shutter control. LIN is a two-way 1-wire communication bus, so the shutter should be reporting back it's actual position in this application. GM may also have a feedback-loop.If the shutters aren't operating correctly a check engine light will set.
Rob